//
// PrintHandler.h
//
// Library: JSON
// Package: JSON
// Module:  PrintHandler
//
// Definition of the PrintHandler class.
//
// Copyright (c) 2012, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef JSON_PrintHandler_INCLUDED
#define JSON_PrintHandler_INCLUDED


#include "Poco/JSON/Handler.h"
#include "Poco/JSON/JSON.h"
#include "Poco/JSONString.h"


namespace Poco
{
namespace JSON
{


    class JSON_API PrintHandler : public Handler
    /// PrintHandler formats and prints the JSON object
    /// to either user-provided std::ostream or standard output.
    /// If indent is zero, the output is a condensed JSON string,
    /// otherwise, the proper indentation is applied to elements.
    {
    public:
        typedef SharedPtr<PrintHandler> Ptr;

        static const unsigned JSON_PRINT_FLAT = 0;

        PrintHandler(unsigned indent = 0, int options = Poco::JSON_WRAP_STRINGS);
        /// Creates the PrintHandler.

        PrintHandler(std::ostream & out, unsigned indent = 0, int options = Poco::JSON_WRAP_STRINGS);
        /// Creates the PrintHandler.

        ~PrintHandler();
        /// Destroys the PrintHandler.

        void reset();
        /// Resets the handler state.

        void startObject();
        /// The parser has read a '{'; a new object is started.
        /// If indent is greater than zero, a newline will be appended.

        void endObject();
        /// The parser has read a '}'; the object is closed.

        void startArray();
        /// The parser has read a [; a new array will be started.
        /// If indent is greater than zero, a newline will be appended.

        void endArray();
        /// The parser has read a ]; the array is closed.

        void key(const std::string & k);
        /// A key of an object is read; it will be written to the output,
        /// followed by a ':'. If indent is greater than zero, the colon
        /// is padded by a space before and after.

        void null();
        /// A null value is read; "null" will be written to the output.

        void value(int v);
        /// An integer value is read.

        void value(unsigned v);
        /// An unsigned value is read. This will only be triggered if the
        /// value cannot fit into a signed int.

        void value(Int64 v);
        /// A 64-bit integer value is read; it will be written to the output.

        void value(UInt64 v);
        /// An unsigned 64-bit integer value is read; it will be written to the output.

        void value(const std::string & value);
        /// A string value is read; it will be formatted and written to the output.

        void value(double d);
        /// A double value is read; it will be written to the output.

        void value(bool b);
        /// A boolean value is read; it will be written to the output.

        void comma();
        /// A comma is read; it will be written to the output as "true" or "false".

        void setIndent(unsigned indent);
        /// Sets indentation.

    private:
        const char * endLine() const;
        unsigned indent();
        bool printFlat() const;
        void arrayValue();
        bool array() const;

        std::ostream & _out;
        unsigned _indent;
        std::string _tab;
        int _array;
        bool _objStart;
        int _options;
    };


    //
    // inlines
    //
    inline void PrintHandler::setIndent(unsigned indent)
    {
        _indent = indent;
    }


    inline bool PrintHandler::array() const
    {
        return _array > 0;
    }


}
} // namespace Poco::JSON


#endif // JSON_PrintHandler_INCLUDED
